* htword/WordList.cc: kill Collect(WordSearchDescription) which
was useless and error prone.

* htword/WordDB.h (WordDBCursor::Get): small performance improvement
by copying values only if key found.

* htword/WordDB.h,WordList.cc: fix reference counting bug when
using Override (+1 even if entry existed). Turn WordDB.h return
values to be std Berkeley DB fashion instead of the mixture with
OK/NOTOK that was a stupid idea. This allows to detect Put errors
and handle them properly to fix the Override bug without performance
loss.

* test/conf/httpd.conf.in: comment out loading of mod_rewrite
since not everyone has it.